Update CONTRIBUTING.md, fix typo [ci skip]
Update CONTRIBUTING.md, fix typo [ci skip]

chenjiancan/wechatpy,zaihui/wechatpy,mruse/wechatpy,Luckyseal/wechatpy,EaseCloud/wechatpy,zhaoqz/wechatpy,Dufy/wechatpy,wechatpy/wechatpy,cloverstd/wechatpy,hunter007/wechatpy,messense/wechatpy,zhaoqz/wechatpy,cloverstd/wechatpy,tdautc19841202/wechatpy,zaihui/wechatpy,Luckyseal/wechatpy,Luckyseal/wechatpy,mruse/wechatpy,cysnake4713/wechatpy,tdautc19841202/wechatpy,EaseCloud/wechatpy,tdautc19841202/wechatpy,cysnake4713/wechatpy,chenjiancan/wechatpy,cysnake4713/wechatpy,hunter007/wechatpy,Dufy/wechatpy,navcat/wechatpy,navcat/wechatpy,jxtech/wechatpy